yes, there is no need to make aluminum and copper cheaper for other countries. It just decreases your own industry's competitiveness in the downstream products.Just looked, but this news doesn't seem to have been posted here:
This is actually quite significant, and can result in inflationary pressure on western economies.
Chinese commentary on it (it's a new turning point, where these export tax rebates once was to help export companies, but now, no longer really needed. And it will cause inflationary pressure on western countries):